Copy dji-sdk-4.4.1.aar to your libs folder to develop, rename it to dji-sdk-4.4.1.aar.zip, extract the classes.jar, rename classes.jar to dji-sdk-4.4.1.jar
com.secneo.sdk.helper is in this jar...
If you are using V4.5 then you should do this with the dji-sdk-4.5.aar -> classes.jar -> dji-sdk-4.5.jar
Note that this jar is only needed when compiling the library. At runtime (in B4A) it is included in the AAR. So; do not copy it to additional libs folder.
PD: You should have posted your question
HERE!