Ledgerium is a company that brings Blockchain to the accounting and audit industry. The whitepaper is well structured but the team has no linkedIn links. The amount of 5 LGUM you receive is ridiculous low because 1 ETH = 120,000 LGUM. Therefore the 5 tokens are worth less then $0.03. That's a huge downside.
Estimated Value : $1.5http://ledgerium.coinairdrop.info/en/invitations/?from=4f1b67cee1