This weird hissing sound in my DAW (VST Plugin problem)

[Bagel Company Co. Games 0]

I have this weird hissing sound that plays when I put some VST plugins in to it. The hissing sound starts quiet, then keeps getting louder, the abruptly stops. I tried to ignore it, but it comes up in the MP3 Export. What is it and what do I do???

[msmcleod 3,439]

Most probably a VST that hasn't been authorised.  Quite a few VST's emit periodic white noise once their trial period has ended.

[Bagel Company Co. Games 0]

Yes I think that is the reason - I'm using a TAL J 8 Demo version