CA1272800A

CA1272800A - Apparatus and method for preventing unauthorized dubbing of a recorded signal

Info

Publication number: CA1272800A
Application number: CA000523718A
Authority: CA
Inventors: Kenji Nakano
Original assignee: Sony Corp
Current assignee: Sony Corp
Priority date: 1985-12-04
Filing date: 1986-11-25
Publication date: 1990-08-14
Anticipated expiration: 2007-08-14
Also published as: JPH0743825B2; JPS62132233A; US4775901A; KR870006511A; EP0224929A3; EP0224929A2

Abstract

APPARATUS AND METHOD FOR PREVENTING
UNAUTHORIZED DUBBING OF A RECORDED SIGNAL

ABSTRACT OF THE DISCLOSURE
In a reproducing and recording or dubbing system there are provided a reproducing apparatus for reproducing from a first tape recorded composite data which includes pulse code modulated information data mixed with control data having first and second states for indicating that re-recording of the associated information data is to be prevented and permitted, respectively, a recording apparatus for recording on a second tape composite data reproduced from the first tape, a detector for detecting the states of the control data in the composite data reproduced from the first tape, a generator for generating a dubbing protect control signal in response to detection of the first state of the control data, a line for transmitting the reproduced composite data from the reproducing apparatus to the recording apparatus, and a switch interposed in the line for transmitting the reproduced composite data and being operated by the dubbing protect control signal to interrupt the transmission of the reproduced composite data to the recording apparatus and thereby prevent recording or copying of the reproduced composite data on the second tape.

Description

BAC~;GROUWD OF THE I~VEMTICN
Fiel d ol~ the Invention This invention relates to the prevention of the unauthorized dubbing or pirating of a recorded signal.
Descri~tlon of the Prior Art As is disclosed in U.S. Patents Nos. 4,163,253 and 4,100,575, it is known to protect agains~ the unauthorlzed reccrding and xeproducing of transmitted video signals.
~owever t the conventional technology provided for such an anti-piracy system is not sufficiently reliable.
OBJECTS AND SUM~ARY_OF T~E INVENTION
Accordingly, it is an object of this inv~ntion to pro~de an improved method and apparatus for preventiny unau~horized dubbing, that is, reproduction of a recorded signal and recording thereof, and which can avoid the defects encountered with the prior art method and apparatus.
It is another object of this invention to provide a reproducing and recording system employing video tape recorders which incorporate anti-piracy devices.
According to one aspect of the present invention, there is provided, in a reproducing and recording system, the combination of: a reproducing apparatus for reproducing from a first tape recorded composite date which includes pulse code modulated information data mixed with control data having first and second states for indicating that re-recording of the associated information data is to be prevented and permitted, respectively; a xecording apparatus for recording on a second tape composite data reproduced from said first tape; detecting means for detecting said ~'q .. ~
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s.ates o~ said cGntrol da~a in said ~omposite data repro~uced from said first tape; means for generatlng a dubbing protec~ control signal in response to detection of said first state of said control data; means for transmitting said reproduced composite data from said reproducing apparatus to said recording apparatus; and swi`chins means interposed ln said means for transmitting and being operated by said dubbing protect control signal to interrupt the transmission of said reproduced composite data to said recording apparatus and thereby prevent recording of said reproduced composite data on said second tapeO
In a preferred embodiment of the invention, the means for generating the dubbing protect control signal includes counting means for counting the number of times the control data is detected to be in said first state thereof, and means providing said dubbing protect control signal only when said counting means counts to a predetermined value.
In accordance with another aspect of this invention, a method for preventing the use of a reproducing apparatus combined with a recording apparatus for unauthorized dubbing of a recorded information signal oomprises recording dubbing protection control data with the information signal to provide a recorded composite signal;
reproducing the recorded composite signal in said reproducing apparatus; detecting the presence of said dubbing protection control data in the reproduced composit0 signal; and intercepting or inhibiting transmission of the reproduced composite signal from the reproducing apparatus to the recording apparatus in response to the detection of 1272~300 . ' ' , the dubbing protecticn control data in the reproduced composi~ signai, thereby preventing copying of the latter.
The above, and other objects, features and advantages or the present invention, will become apparent from the following detailed description or the invention that is to be read in conjunction with the accompanying drawings, throughout which the same reference numerals identi-y like elements and parts.
ERIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a diagrammatical representation of a data arrangement for one field of a digital audio signal that is desirahly employed when applying the present invention to 8-mm VTRs;
Fig. 2 is a diagrammatical representation of a block of the data included in the arrangement of Fig. l;
Fig~ 3 is a chart to which reference will be made in explaining control word data provided according to this invention;
Fig. 4 is a block diagram showing a reproducing-recording system according to one embodiment of the present invention;
Fig~ 5 1S a block diagram showing a reproducing-recording system according to anothex embodiment of the present invention;
Figs. 6I and 6II together form a block diagram showing a practical circuit arrangement of the system of Fig. 4; and 127280~) -', ', -' ' '' - .,, - : ' .
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Figs. /A ~o 7J are -timing charts to which re erence will be made in explaining the operatio~ of the system shown in Figs. 6I and 6II.
DESCRIPTION OF THE PREFERRED EMBODI~ENTS
It is now generally well known to use a so-called 8-mm video tape recorder (VTR) for recording on a magnetic tape, by mear.s or a rotary head, a digital audio signal together with a video signal, or the digital audio signal alone in a so-called multi-PCM mode. Fig. 1 shows a data arrangement of one field of a digital audio signal, as disclosed in U.S. Patent No. 4,562,578 having a common assignee herewith, and which is desirably employed when applying the present invention to such 8-mm VTR.
In the data arrangement of Fig. 1, one word consists of eight bits, specifically, n=8 words, m=132 blocks, and n x m = 1056 words. The digital audio signal of one field in the NTSC system is 1050 words, so that, when the s~mpling frequency is 2fh (where fh is the horizontal fre¢uency), six words of control data (IDo,ID1...ID5) must be added to the words in one field of the NTSC system, preferably at the beginning therPof. In other words, six words of control data are added to the digital audio signal in one field, which is sequential as follows: Lo,Ro,Ll,R1, R2, .L522,R522~L523 and R523 The 1056 words that include the control data IDo to ID5 are arranged so that there is a distance of 44 blocks in the lateral direction at every two words, that is, two-by-two, such as, IDo-ID1,ID2-ID3,ID4-ID5, and so on. In ~L27~30~

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a har~are im~iementation, thls may be achieved by writing, at 2ddresses ~eparated by 44 blocks, in response to the add-ess ccntrol of a random access memory (RA~). If the control data or parity data are separated, then two words Li and Ri are arranged in the lateral direction or left to right direction in relation to ~ig. lo The reason the digi.al audio signal is interleaved by being divided into th-ee in the lateral direction is that the correctable burs~
error length is thereby maximized, when using, for example, a mean~value interpolation. More particularly, by such lateral arrangement of Li and ~i, the correctable length can be made longer as compared with the case where they are axranged in the longitudinal direction or the up and down direction in Fig. 1.
Two parities, either odd or even, are added to the digital audio signal of one field that includes the control data. If the audio data series in each row of the above matrix structure is ta]cen as WO,Wl,...W7, a first parity series P having eight words in each data series is formed with a distance between such words of 14 blocks or 15 blocks in the lateral direction.
Moreover, nine words, each of which is taken from the audio data series WO to @7 and the parity series P, form a second parity series Q with a distance of twelve blocks between adjacent elements. The first parity series P is positioned at the center of one block, while the second parity series Q is positioned at the end o~ the block.
Since the probabiIity is high that errors occurring in data at the center of the block will be impossible to correct, .

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the pari~y series P is located at the center of the block, since it is less important than audio data, and the parity series Q is positioned at the end OI the block in order to ma~imize the distance between successive words -that form the parity series P.
Each group of 132 blocks includes an eight-word d`qital audio signal, two-word parity data, and a cyclic redundancy check (CRC) code for error detection which may involve 16 bits added to the data of each block. A block synchronizing sisnal SY and a block address signal AD are also addPd to the group of blocks before it is recorded on a magnetic tape. If data cf the first block is taken out of context and examined separa~ely, it will appear as shown in Fig. 2, it being understood that after this block there will follow the second block, the third block, ... up to the 132d block, moving left to right in Fig. 1.
The six words of control data IDo to ID5 will now be described with reference to Fig. 3. These control data words IDo to ID5 are each formed of eight bits Bo to B7.
The control data words IDo to ID4 are allocated ~o utility word data. For example, word IDo may be a mode code and, on the basis of the value of such control data word IDo, the words IDl to ID~ are made to selectively represent a tape count or distance along the tape, a program number, the data and day of the week when recording is being effected, the hour, minute, second and frame of the recording, a table of contents and a control code for the multi-PCM mode.
The word ID5 can express various kinds of control data by its several bits. First of all, in accordance with ~272~00 .
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this inventicn/ blt B7 of wora ID5 represents the dubbing ~rotect mode, for e~ample, dubbing ls to be prevented wken bit B7 is at a high level or n 1". Bits B5 and B6 represent start and stop information, for example, as shown on Fig. 3, the record start point is indicated when bit B5 is "1" and B6 is "O", the re~ord end point is indic~ted when B5 is "O"
and B6 is "ln, both bits B5 and B6 are "1" be~ween the recording start and end points, and both bits B5 and B6 are "0~ io indicate that these bits are to be ignored. Bits B3 and B~ represent the nature of information recorded in channels CHl and C~2, respectively. For example, the bit B3 or B~ is n 11l when the audio signals are recorded in the respective channel CHl or CH2, and the bit B3 or B4 is ~o n when the respective channel has other information signals recorded ~herein. Bits Bl and B2 indicate the recording mode, for example, as shown, monaural sound is recorded in both channels when Bl and B2 are both "O", stereo sound is recorded (L in channel C~l and R in channel CH2) when Bl is "O" and B2 is "1", bi-lingual recording is effected when Bl is "1" and B2 is "O", with channel CHl receiving the main or basic sound and channel CH2 racelving the secondary sound or translation, and other modes of recording are indicated when Bl and B2 are both "ln. Finally, the bit Bo indicates tha validitv or invalidity o~ all of the other bits Bl to B7 of word ID5. For example, the following bits Bl to B7 are v~lid when Bo is 1'1", and Bo is "1" should be written at least once per second.
Accordingly, when the manufacturer of software tape produces a large number of slave tapes by copying from 72~3~)0 - :. . .. -. : .
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a mas~er t2~e ~hrcush the use of a printer such as ~JTR, it is si~ple, when using the VTP~, to dub the master tape so as to recor~ "1" a~ the bit data B7 of the control wcrd ID5.
Therea ter, anyone else using an apparatus according to ~he present invntio~ is preventing frcm pirating, that is, making an unauthorized recording, of either the master tape or slave tape in which the bit B7 of word ID5 is "1".
Referring now to Fig. 4, it will be seen that a copying or reproducing and recording system 6 accordins to one emDodiment of this invention generally comprises video tape recorders (VTRs) 1 and 2 which are of the so-called 8-mm VTR-type and may be constructed integrally as a unitary structure or provided separately with the connecting cables.
The VTR 1 is essentially a reproducing Vl'R and the VTR 2 is a recording VTR. The VTRs 1 and 2 may be provided with the same construction which includes a recording circuit and a reproducing circuit even though both of those circuits are not used in each VTR. In Fig. 4, only those circuit elements necessary for understanding the present invention have been illustrated. Thus, it will be understood that each of the VTRs 1 and 2 further includes a rotary magnetic head to record either a digital audio signal alone, or-together with a video signal, in oblique tracks on a magnetic tape and to reproduce the same from the-magnetic tape.
The VTR 1 is shown to be provided with at least a reproducing circuit 3, while the VTR 2 is provided with at least a recording circuit 4~ Further, the reproducing VTR 1 is provided with a dubbing protect control signal generating 9~Z7~30~

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, Ci-CUit ~ his circuit 5 is adap~Z to det~t when bit B7 of ~ord ID5 1~ a digital signal S reproduced by r~producing circ~it 3 is n ~ and, in response to the detected B7=1, to generâte a dubbing protec~ control signal P. The system 6 accoraing to this invention further includes a switch S~, wnich in the embodimerlt of Fig. 4, is provided in the recording VTR 2 as a signal recording prevention circuit.
In the reproducing VTR 1, the digital audio signal and the video signal recorded on a master or other tape being played therein are reproduced by the rotary magnetic head and then fed to reproducing circuit 3. The reproduced digital audio signal alone or with the video signal are applied rom reproducing circuit 3 through a tra~smission line 7 to the switch SW in VTR 2 and then to the recording circuit 4. The digital audio signal from recording circuit 4 is recorded in oblique tracks on a slave tape by the xotary magnetic head of VTR 2.
Further, the dubbing protect control signal P from dubbing protect control signal generating circuit 5 of reproducing VTR 1 is supplied through a transmission line 8 to switch SW in the recording VTR 2, and functions to control such switch SW. More specifically, in the dubbing protect control signal generating circuit 5, when bit B7=1 in word ID5 is detected, circuit 5 generates the dubbing protect control signal P which opens switch SW in VTR 2 so that the signal S reproducing by VTR 1 cannot reach recording circuit 4 in VTR 2 and hence cannot be recorded by the latter on a slave tape therain. On the other hand, whenever bit B7=0 in word ID5, switch SW remains in its .
-' ~ ' ~ ' ' ' ' ' ' .

.
, normal closed condition so there is no interfer~nc~ ~ith the recording by VTR 2 of the signal S reproduced in VTR 1.
Alternatively, in an apparatus 6' according to another embodiment of this invention, the dubbing prot~ct control signal generating circuit 5' may be provided in the recording VTR 2, as shown in Fig. 5. In this case, it is sufficient that only the tran~mission line 7 for the reprcduced video and audio signals S is provided between ~TRs 1 and 2 and the bit B7 in word ID5 is detected in the dubbing protect control signal generating circuit 5 in VTR

2. Once again, when the detected bit B7 is "1", the resulting dubbing protect control signal P is applied to switch SW in VTR 2 to open the same and thereby prevent the reproduced signal S from reaching the recording circuit 40 Referring now to Figs. 6I and 6II which show, in greater detail, pra~tical circuit arrangements for ~he ma~ter VTR 1 and the slave VTR 2 represented only generally on Fig. 4, it will be seen that the VTRs 1 and 2 may be similar with the parts Gf VTR 2 which correspond to those in VTR 1 being identified by the same reference numerals but with primes appended thereto. Further, only the connections betwe~n VTRs 1 and 2 drawn in bold or heavy lines are used when the system according to this invention is authorized to record in slave VTR 2 the signals being reproduced in master VTR 1.
In order that the roles of VTRs 1 and 2 may be reversed, that is, the VTR 1 may be used as a recording VTR
and the VTR 2 used as a reproducing VTR, each of the VTRs 1 and 2 is provided with a dubbing protect control signal ~:27 ,. ~ :' ' .
` - , : ~, ger.e~tins circult 24 or 24' and a sign~1 recording prevention circui. S-wA,S~V or SWA' ,SWV' in addition to recGrding an2 reproducing circuits.
More specifically, as shown on Fig. 6I, master VTR
l is provided with recording/reproducing rotary magnetic heads ~a and Hb. ~ recording/reproducing block 10 is provided with recording/reproducing amplifiers lla and llb ar.a a recording/reproducing change-over switch 13. The rotary ~agneiic heads Ha and Hb are respectiveiy connected to recordin~/reproducing amplifiers lla and llb which are, in turn, connected selectively through change-over switch 13 to ~n FM-modulator/demodulator 12 or a video sisnal p~ocessQr circuit 15 in a video block 14. A switch signal a ~Fig. 7A) is applied to head change-over switch 13 for controlling the latter. A video signal input terminal VI
and a video signal output terminal VO are connected with video signal processor circuit 15.
A digital processor block 16 for processing an audio signal is shown to include a circuit 17 for effecting error correction, mean-value interpolation and 10-8 bit converting, an A/D ~analog-to-digital) converter 18, a D/A
~digital-to-analog) converter 19 and memories 20 and 21.
The FM-modulator/FM-demodulator 12 is connected to the error correction mean-value interpolation/10-8 bit converting circuit 17 which is, in turn, connected with A/D converter 18, D/A converter 19 and memories 2G and 21.
A noise reduction block 22 is provided with an analog noise reduction circuit 23 which is connected to A/D
converter 18 and D/A converter l9o An audio signal input ~LX'72~30~) , ~ .
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termina ~T an~ an audlo slgn~l output terminai AO are ccnnected with analog ~oise reduc~ion circui~ 23.
In accordance with this invention, VTR 1 is provided with a circuit 24 for generating a dubbing protect cc,ntrol signal, and which includes a control word data me~ory 25 connected to error correction/mean-value interpolation/10-8 bit converting circuit 17. The output reac from me~ory 25 is supplied to a detection circuit 26 for detecting the bit data B7 of control word ID5. The output frcm detection circuit 26 is supplied to an up/down counter 27 which receives, as a cloc~ signal, a field timing signal b (having a frequency of 60 Hz) from a texminal 28 A parallel output from counter 27 is supplied to a decoder 29~ The output from decoder 29 is supplied to a D input terminal of a D flip-flop circuit 30 which also receives at its clock input terminal CX, the field timing signal b from terminal 28 and, at its set terminal S, a voltage relating to a power source voltage from a terminal 31. A dubbing control signal output terminal DO is led out of the non-inverting output terminal Q of flip-flop circuit 30.
On-off switches S~A and SWv are provided in VTR 1 to respectively interrupt the digital audio signal and the video signl when VTR 1 is used for recording. On-off switches SWA and SWV are respectively interposed between audio signal input terminal AI and analog noise reduction circuit 23 and between the video signal input terminal VI
and video signal processor circuit lS.
The signal from a dubbing control signal input terminal DI is supplied through an inverter IV to switches 72~

-I~A âna S'~'~V tG control the opening ana closing th~eof.
HGwe~e-, when the VTR 1 is used as the master VTR, as in the illustratea c2se, input terminals DI,AI and switches SWA,SWV
ar~ not used. As earlier noted, and as is apparent from Flg. 6II, VTR 2 includes all of the above described elements or parts of VTR 1 identified by the same rererence numerals, but with primes apper.ded thereto. However, in the illustrated case where VTR 2 is used as a slave VTR for recording on a second or slave tape signals reproduced from the master tape by VTR 1, dubbins control signal output terminal DO of VTR 1 is connected to dubbing control signal input terminal DI' of VTR 2, and audio and video output terminals AO and VO of VTR 1 are connected to the audio and video input terminal AI' and VI', respectively, of VTR 2.
The operation of the reproducing and recording system having the detailed circuit arrangements of Figs. 6I
and 6II, will now be described with reference to Figs. 7A to 7J. More particularly, Fig. 7A shows a switching signal a having the frequency of 30 Hz and which is used to control head change-over switch 13. Fig 7B shows a field timing signal b having the frequency of 60 Hz and which is applied to terminal 28. This field timing signal b is synchroni~ed with the switching signal a shown in Fig. 7A. Fig. 7C
represents a reproduced digital audio signal c that is obtained from audio signal output terminal AO of the r~producing or master VTR 1.
As in the embodiment described earlier with reference to Fig. 4, the digital audio signal and the control word data recorded on the master tape are reproduced .

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' .. ' '~,; ,' ~', -''` ', ~-' '-. -, '' ' ' '', ' ' ' , ' D~. reproducing VTR 1. ~he control cr identiflc~tion word da,~ d (Fig. 7D) in the reproduced signal is stored ln ID
me~oxy 25 or VTR 1. If the bit data B7 of the control word ID5 in the control word data stored in ID memory 25 is "1l' ~that is, at a hi~h level), this fact is detected by detec~ing circuit 26. As a result of the foregoing, circuit ~6 provides a detected output e (Fig. 7E) to an enable input terminal of coun_~r 27. The enabled counter 27 starts coun.ing the field tir.ing signal b and the counted value therPof is changed in the order of 0,1,2,...n,...m, as shown in Fig. 7F. The counted valu~ of counter 27 is deccded by decoder 29. When the decoded value becomes larger than n (n is an integer of sufficiently large value), that is, when bit B7 of word ID5 has been detected to be "1" for a predetermined number n of field periods, decoder 29 generates an output g ~Fig. 7G) which is fed to the D input terminal of flip-flop circuit 300 The reason counter 27 is made to count the field timing signal b more than n times before decoder 29 generates output g, is to ensure that bit data B7 will not bP erroneously detected by circuit 24 due to noise or the like. Flip-flop 30 is set by the voltage applied to terminal 31 each time the power switch of VTR 1 is turned ON. Consequently, the non-inverting output h and the invèrting output i, from terminal Q and Q, respectively, of flip-flop circuit 30 are reversed in level, as shown in Figs. 7H and 7I, when bit B7 of word ID5 is detected to be "1" for a predetermined time. The output h, which constitutes the dubbing protect control signal ~Fig. 7H) is derived at dubbing protect control signal output terminal DO

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or VTR 1 zrc is suppli~a ~herefrom to inpu~ termin~1 DI' of recordina VTR 2 (Fig. 6II). From input terminal DI', the dubbinc protect control signal h is applied through inverter IV' to switches SWA' and S~V', as a switch control signal therefor. It will be seen that, due to inverter IV', the switch control signal changes over from "0" to "1" in response to the detection of B7=" 1 " in ID5 or a predetermined number n of field intervals, and, accordingly, switches S~YA' and S~NV ' are changed-over to their OFF or opened conditions, as shown on Fig. 6II.
Accordingly, the digital audio signal c (Fig 7C) ~nd the video signal j (Fig. 7J) are not supplied to the analog noisa reduction circuit 23 and the video signal processor circuit 15' of recording VTR 2. As a result, the digital audio signal (including the control word data) reproduced from the master tape by the reproducing VTR 1 can not be recorded on the slave tape by the recording VTR 2 in the dubbing record modeO Similarly, the video signal can not be recorded in the dubbing record mode.
Of course, if bit B7 of control word ID5 is detected by detector 26 to be "0", counter 27 is not enabled and does not count the clock signal b at the field frequency so that the output g from decoder 29 remains low and does not trigger flip-flop 30. In that case, the dubbing protect control signal h obtained at the Q output of flip~flop 30 remains hish. Such dubbing protect control signal applied to input terminal DI of the recording VTR 2 causes switches SWA' and SWV' to remain in their closed or ON positions with the xesult that the digital audio signal and the video 1~:72~

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_i~na' ~eing r~produced in VTR 1 can be recGrded cn the sla~-e tape by VTR 2 in the dubbing record mode of the s~ste~. Thus, the status of bit B7 OI the control word ID5 recorded on the master tap~ determines whether or r.ot the associated digital audio signal, or the associated digital audio signal and video sisnal, can be recorded on the~ slave ~ape in the dubbing record mode of the system.
~ ltAough the dubbing protect control data is the bit B7 OL word ID5 in the above-described embodiment, the d~bbing protect con~rol data may be any par of the disital signal, the ~nalog signal, the video signal, the audio signal or the data signal, but it is desirabie to use data mi~ed into a portion of the arbitrary PCM data as at least the control data. For e~ample, this invention can be applied to a so-called multi-segment PCM VTR which employs a VTR having an 8-mm format as an apparatus for recording and raproducing only a PCM audio signal.
By way of summary, it will be seen that, in accordance with the present invention as set forth above, it is possible to positively prevent dubbing of a magnetic tape on which information data and control data including the dubbing protect control data are recorded.
Although illustrative embodim~nts of the invention have been described above with reerence to the drawings, it will be apparent that the invention is not limited to those precise embodimants, and that many modifications and variations could be effected therein by one skilled in the art without departing from the spirit or scope of the invention as defined by the appended claims.

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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH
AN EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED
AS FOLLOWS:

1. In a reproducing and recording system, the combination of:
a reproducing apparatus for reproducing, from a first tape, recorded composite data which includes field arrangements of pulse code modulate information data mixed with control data for each field which has first and second states for indicating that re-recording of the associated information data is to be prevented and permitted, respectively;
a recording apparatus for recording on a second tape composite data reproduced from said first tape;
detecting means for detecting said states of said control data in said composite data reproduced from said first tape;
means for generating a dubbing protect control signal, including counting means for counting the number of successive fields of the reproduced composite data in which the respective control data are detected to be in said first state thereof, and means providing said dubbing protect control signal only when said counting means counts to a predetermined value substantially greater than one;
means for transmitting said reproduced composite data from said reproducing apparatus to said recording apparatus; and switching means interposed in said means for transmitting and being operated by said dubbing protect control signal to interrupt the transmission of said reproduced composite data to said recording apparatus and thereby prevent recording of said reproduced composite data on said second tape.

2. The reproducing and recording system according to claim 1; in which said detecting means and said means for generating the dubbing protect control signal are provided in said reproducing apparatus, and said switching means is provided at the end of said means for transmitting said recording apparatus.

3. The reproducing and recording system according to claim 2; further comprising second means for transmitting said dubbing protect control signal from said reproducing apparatus to said switching means in said recording apparatus.

4. The reproducing and recording system according to claim 1; in which said detecting means, said means for generating the dubbing protect control signal and said switching means are provided in said recording apparatus.