I would skip this round if the lambda design changes so drastically. Sure it's just one key but it strongly contributes to the overall appeal to me. Does Valve really hold a trademark over a standalone Greek character? When there is a circle around it - sure, but just one standard-looking sans-serif character on it's own?
They do not own the trademark for the greek lambda sign as a whole. Its about the font. I suppose this sign (which was used in round 1) was extracted from the game btw. whoever created it - owns the rights. Since the licinse is unknown its just unsafe to continue to use it. If i see somewhere a proper license for it i can then decide to use it or not. Again it depends on license. Thus the free destribution of the HalfLife font on all the font sites is questionable without any license attached to it. Is it legal or not?
I get a feel people dont get how it works with IP and rights. What ever you create by your own its yours. You are the autor. The IP is applied to it automaticly. This is how it works in the most parts of the western world. For example the warning signs those i've created by myself btw the vector graphics belong to me. Its not about the warning signs usage its about these svgs i've done. If you want to use them rightfully you need to ask me or you do create your own warning signs with your own ip and you can do what ever you want with these.
Because how it works i cant use it, though i would love to keep it.
I did some digging, valve has a few trademarks, these are easily identified with their (TM) or (R) symbols:
https://en.wikipedia.org/wiki/Valve_Corporation - can't use that, it's a registered logo
https://en.wikipedia.org/wiki/Half-Life_(series) - can't use the "HλLF-LIFE" logo, that's also registered.. but note the orange "λ", it is NOT
https://en.wikipedia.org/wiki/Half-Life_2 - can't use the lambda "squared" logo, that's registered (also note the nested "HλLF-LIFE" registration)
For the life of me I can't find a registered version of the singular lambda enclosed in a circleNot to say it's smooth sailing, but a standalone orange lambda would not appear to have any conflict, even enclosing an orange lambda in an orange circle wouldn't appear to infringe on any rights..
Edit - this is on the bottom of the Valve site:
© 2017 Valve Corporation. All rights reserved. Valve, the Valve logo, Half-Life, the Half-Life logo, the Lambda logo, Steam, the Steam logo, Team Fortress, the Team Fortress logo, Opposing Force, Day of Defeat, the Day of Defeat logo, Counter-Strike, the Counter-Strike logo, Source, the Source logo, Counter-Strike: Condition Zero, Portal, the Portal logo, Dota, the Dota 2 logo, and Defense of the Ancients are trademarks and/or registered trademarks of Valve Corporation. All other trademarks are property of their respective owners.
Would just need to determine what constitutes as the "Lambda Logo", that could reference the logo used for HL2..