No, you do not. DesignSpark Electrical is free to download & use, no matter where you're from or what your profession is.
You will have full ownership (including Intellectual Property - IP) of any project you create with DesignSpark Electrical. You may view/print a copy of the end user licence agreement, available here.
If you require more than 3 schematics per project and additional features, you may consider upgrading to SOLIDWORKS Electrical using an exclusive offer. Details here: https://designspark.zendesk.com/hc/en-us/articles/211239809-Is-there-a-paid-upgrade-for-DesignSpark-Electrical-and-how-do-I-unlock-its-limitations-