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It's proper to have file versions without a trademark, with ™ or ℠, and with ® as each one designates different periods of protection for your logo.
What is a misuse of trademark registration symbol? - Red Points
What is the difference between a trademark, logo, symbol, or are they all the same? - Quora
Trademark Symbols & its meanings
How to Use the Trademark Symbol to Protect Your Intellectual Property on the Web
Trademark Symbols (®), TM, SM – A Complete Guide
Super Important Use of Trademark Symbols with Your Unique Brand – Sagacity Legal Blog
What Do the Little Trademark Symbols Mean, and Why Do We Use Them?
What's the difference between TM, SM and ®?
Which trademark symbol can you use: ®, TM or SM?
Registered trademark symbols and their uses