I was a webmaster for a local baseball league in Texas and created a logo for the league's use. I never had them sign permission to use the logo and never waived my rights to the art. I was not even the webmaster when I created it, I became the webmaster later and designed the league's website based on the logo.

Now, I have had a falling out with the league pres., am no longer member and I don't want them to use my logo.

Besides, HE has modified it without my authority on several occasions.

Any legs to stand on here or should I just let this lie?