The DOAJ seal is attributed to the DOAJ journals that exemplify the best practices of Open Access and peer review. This is a great way of increasing the credibility of your journal and making it an attractive space for scholars.
The criteria for the Seal is listed on the application page, and it is here as well:
have an archival arrangement in place with an external party (Question 25). 'No policy in place' does not qualify for the Seal.
provide permanent identifiers in the papers published (Question 28). 'None' does not qualify for the Seal.
provide article level metadata to DOAJ (Question 29). 'No' or failure to provide metadata within 3 months do not qualify for the Seal.
embed machine-readable CC licensing information in article level metadata (Question 45). 'No' does not qualify for the Seal.
allow reuse and remixing of content in accordance with a CC BY, CC BY-SA or CC BY-NC license (Question 47). If CC BY-ND, CC BY-NC-ND, 'No' or 'Other' is selected the journal will not qualify for the Seal.
have a deposit policy registered in a deposit policy directory. (Question 51) 'No' does not qualify for the Seal.
allow the author to hold the copyright without restrictions. (Question 52) 'No' does not qualify for the Seal.