If anyone posts an example of their work and does not want it to be copied in any form, then they should state so in their post. Regardless of the legal aspects, I would hope that other members would respect that. There are ways to show examples of work without giving away too much, such as a jpg that has any company identifiers left out to prevent stealing of customers. I would think that posting an actual Corel file is an open invitation to copy it
except when it's posted to ask for help with a technical problem running it.
Those should be considered off-limits for copying unless permission is given by the poster.
I have posted examples of work here that I specified as patented by my customer just to avoid any confusion.
Sammamish, WA
Epilog Legend 24TT 45W, had a sign business for 17 years, now just doing laser work on the side.
"One only needs two tools in life: WD-40 to make things go, and duct tape to make them stop." G. Weilacher
"The handyman's secret weapon - Duct Tape" R. Green