what are the known copy protection methods for DVD+-RW (recordable media) ?
I found out about CPRM for DVD-RW and "Vidi" for DVD+RW , 
my question is how much are those methods are supported or expected to
be supported by DVD players/recorders ?
for example if i make a dvd movie on DVD-RW and protect it with CPRM ,
how many DVD-recorders will be able to read it (and how many players)
?
Also the same question about the "Vidi" system for DVD+RW ?
obviously there will be some standard in the future for such copy
protection to enable recording of Pay-TV movies.
Is there any other standard in the horizon for Recordable-media copy protection ?

another related question is about the new DVD+-VR format . how well is
it the choise for DVD recoders as "recording format" ? i mean what
presentage of DVD recorders support that format and combine it with
copy protection (CPRM/ViDi) ?
what is the forecast for these things ?

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The only "universal" DVD copy protection system (guaranteed to work
with all players) is CSS, but it cannot be applied to recordable DVDs,
due to the smaller sector size (CSS requires sectors with 2053 bytes,
recordable DVD sectors have 2048 bytes).

Nearly all current set-top DVD recorders support CPRM and DVD-VR. In
fact, both are closely related. If a broadcast is protected by CPRM,
you'll only be able to record it in DVD-VR mode (and will then be
unable to copy that recording).

It seems that many players are incompatible with CPRM, however, so it
might not be a very good idea to use use CPRM for distribution.

This page has a list of players, and includes information about some
of the models' (in)compatibility with CPRM:

http://www.rwppi.com/compati/

This site has information about the various copy protection formats:

http://www.extremetech.com/article2/0,1558,55187,00.asp

Pioneer's page for the DVR-7000 only mentions support for DVD-RW discs
in DVD-VR mode, and warns about incompatibility with some players, but
doesn't give any idea of numbers ("CPRM recordings can only be made on
CPRM compliant DVD-RW discs formatted in Video Recording (VR) Mode,
and CPRM recordings can only be played on players that are
specifically compatible with CPRM."):

http://www.pioneeraus.com.au/home_entertainment/dvdplayersandrecorders/DVDRecorder-DVR-7000.html

In the end, anything that can be played back can be copied (either
using a digital decrypter or by re-digitising the analog output).