yes, considering nobody mentioned any bad cache coming from csp in the first place ?

CSP doesn't send the provid (for Canal Digitaal Seca, this would be 00006A, for example).
Instead, the provid is "empty" (only zeros).
Other cards, like for example NDS cards (SkyUK, SkyItalia etc) don't have any specific provid (well, they do, but it's zero :P) ...

This means the following, for the coming example (i use Canal Digitaal 0100 caid and Sky UK 0963 caid as examples) :

oscam cache for Canal Digitaal : 0100&00006A/xxxx
csp cache for Canal Digitaal : 0100&000000/xxxx

oscam cache for SkyUK : 0963&000000/xxxx
csp cache for SkyUK : 0963&000000/xxxx

as you can see, for Canal Digitaal it makes a difference, for SkyUK it doesn't.
the truth is tho (as we know now), that oscam can handle the CSP cache for Canal Digitaal (or any other provider, that uses the provid) aswell !
there's more than just provid and servid ... there's also nwid, and chanid, and in the end, the checksum/hash makes sure that the cache entry coming from CSP also gets recognized, even when it doesn't carry the provid !

In other words : if the zeroes are bugging you (because you want a clean and correct log), then you can filter csp cache out.
But if you want EVERY possible cache hit that is coming into your server, then you need to keep the csp cache too, because there might be alot of positive hits in there ...