Copyrights on technical specifications

I'd like to list technical specs for electronic products on my site. I want to compile it from different sources (other sites, not manufacturers). Is it OK to do that? Tech specifications have not copyrights, right? I know that I should ask a permission, but my question is what consequences might be? (Theoretically it is possible to find out that something was copied from particular source if errors are the same or the same set of parameters, ant so on)